Ultra Screen Saver Maker does not support MPEG-4 (.mp4) videos, but AVI, WMV and MPEG.
The reason is that Microsoft Windows does not support MPEG-4 videos natively unless you have Windows Media Player 12 or some third party codec installed.
Meaning we could not guarantee created screen saver would work on other computers.
We recommended converting .mp4 file to .wmv using video converter such as Any Video Converter Free.
Such .wmv file can be used in Ultra Screen Saver Maker.